A Reformulation of UVN-Flash for Multicomponent Two-Phase Systems with Application to CO2-rich Mixture Transport in Pipelines
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866908558452326400 |
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| author | Kumar, Pardeep Esquivel, Patricio I. Rosen |
| author_facet | Kumar, Pardeep Esquivel, Patricio I. Rosen |
| contents | Pipeline transport of dense-phase CO2-rich mixtures is a crucial component in carbon capture and storage (CCS). Accurate modeling requires coupling of fluid dynamics and thermodynamics, especially during transient events such as depressurization. In this work, we present a unified framework for two-phase multicomponent transport in pipelines that integrates both aspects. Specifically, we employ the homogeneous equilibrium model (HEM) for modeling the transport of two-phase CO2-rich mixture, with thermodynamic closure provided by a Helmholtz energy-based equation of state. Phase equilibrium calculations are performed using UVN-flash, supplemented with a stability analysis procedure to detect phase separation and generate initial guesses for the phase-equilibrium calculations. Specifically, we introduce a novel tailored UVN-flash routine that aligns with the fluid dynamics formulation. This is achieved by introducing an alternative and better-scaled set of variables for the phase-equilibrium calculations. The proposed framework is applied to the depressurization of tanks and pipelines containing CO2-rich mixtures, demonstrating its effectiveness for CCS-relevant applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_20965 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A Reformulation of UVN-Flash for Multicomponent Two-Phase Systems with Application to CO2-rich Mixture Transport in Pipelines Kumar, Pardeep Esquivel, Patricio I. Rosen Computational Physics Numerical Analysis Fluid Dynamics Pipeline transport of dense-phase CO2-rich mixtures is a crucial component in carbon capture and storage (CCS). Accurate modeling requires coupling of fluid dynamics and thermodynamics, especially during transient events such as depressurization. In this work, we present a unified framework for two-phase multicomponent transport in pipelines that integrates both aspects. Specifically, we employ the homogeneous equilibrium model (HEM) for modeling the transport of two-phase CO2-rich mixture, with thermodynamic closure provided by a Helmholtz energy-based equation of state. Phase equilibrium calculations are performed using UVN-flash, supplemented with a stability analysis procedure to detect phase separation and generate initial guesses for the phase-equilibrium calculations. Specifically, we introduce a novel tailored UVN-flash routine that aligns with the fluid dynamics formulation. This is achieved by introducing an alternative and better-scaled set of variables for the phase-equilibrium calculations. The proposed framework is applied to the depressurization of tanks and pipelines containing CO2-rich mixtures, demonstrating its effectiveness for CCS-relevant applications. |
| title | A Reformulation of UVN-Flash for Multicomponent Two-Phase Systems with Application to CO2-rich Mixture Transport in Pipelines |
| topic | Computational Physics Numerical Analysis Fluid Dynamics |
| url | https://arxiv.org/abs/2509.20965 |